27 Questions
What is the primary purpose of an electrocardiogram (ECG)?
To record the electrical activity of the heart
Which of the following is NOT a type of ECG lead?
Bipolar chest lead
Which of the following ECG leads is used to measure the electrical activity between the right arm and left arm?
Lead I
What is the primary purpose of developing a systematic approach to ECG interpretation?
To ensure accurate diagnosis of heart conditions
Which of the following ECG waves represents the depolarization of the ventricles?
QRS complex
What is the primary purpose of calculating the heart rate from an ECG tracing?
To evaluate the patient's overall cardiovascular health
Which limb leads record the electric changes between the right arm and left leg?
Lead II
According to Einthoven's Law, what is the relationship between Voltage in lead II, Voltage in lead I, and Voltage in lead III?
Voltage in lead II = Voltage in lead I + Voltage in lead III
Which chest lead is positioned at the left 5th intercostal space anterior axillary line?
V4
In an ECG, where is the P wave usually located?
Just prior to atrial contraction
Which Augmented Limb Lead records the electric changes from the right arm?
Lead aVR
What does Lead III in unipolar recording represent?
The potential difference between Left arm and Left leg
What is the main cause of the QRS complex in an ECG wave?
Ventricular Depolarization
Which part of the left ventricle does the S wave represent in an ECG wave?
Posterobasal part
What is the voltage range of the T wave in Lead II of an ECG?
0.2 to 0.3 mv
Which of the following is masked by the QRS complex in an ECG wave?
Atrial Repolarization
What does the U wave in an ECG wave represent?
Depolarization of papillary muscles
Which part of the heart does the Q wave represent in an ECG wave?
Interventricular septum
What is the normal range for the P-R interval?
0.12 - 0.20 seconds
What is the definition of sinus bradycardia?
Heart rate below 60 beats per minute
What is the normal range for the electrical axis of the heart?
-30° to +90°
Which of the following conditions can cause right axis deviation?
Right ventricular hypertrophy
What is the primary clinical significance of an electrocardiogram (ECG)?
To detect heart rate and rhythm
Which of the following is NOT a component of a systematic approach to ECG interpretation?
Measuring blood pressure
What is the significance of the P-R interval?
It represents the time it takes for the electrical impulse to travel from the atria to the ventricles
Which of the following conditions can cause left axis deviation?
Left ventricular hypertrophy
What is the definition of a regular rhythm on an ECG?
The R-R interval has equal distance along the ECG
Learn about limb and chest leads, normal ECG waves and intervals, determining heart rate from an ECG tracing, clinical significance of ECG, and how to develop a systematic approach to ECG interpretation.
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